Look, if JEDEC standardises it (which they did) it's in everyone's best interest to apply the standard.
The only thing laptop manufacturers have to gain is selling you a new laptop every for years... Oh.
Jokes aside, the LPDDR soldering has always been a cash grab. With efficient cpus and lack of dedicated gpus I doubt the 4W of RAM is really that much of a battery drain. The only reason you would want a laptop to not be upgradeable is because they don't want you to use your laptop for more than 4 years.
I'd say quick turns in the laptop market is good for innovation, but it's absolutely awful for consumers's wallets and e-waste.